Reflector plate and preparation method therefor, backlight module, and display device

Abstract

A reflector plate (110) and a preparation method therefor, a backlight module (100), and a display device. The reflector plate (110) comprises a reflective base layer (10), a microstructure layer (20) and a flexible coating layer (30), wherein the microstructure layer (20) is arranged on one side of the reflective base layer (10), the flexible coating layer (30) is arranged on the side of the microstructure layer (20) facing away from the reflective base layer (10), and the flexible coating layer (30) is arranged on the surface of the microstructure layer (20).

Description

Reflective sheet, preparation method thereof, backlight module and display device

[0001] The present application claims priority to the Chinese patent application No. 202411028373.X, filed on July 29, 2024, and entitled "Reflective sheet, preparation method thereof, backlight module and display device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of optical film, in particular to a reflective sheet, a preparation method thereof, a backlight module and a display device. BACKGROUND

[0003] With the pursuit of high-quality life quality, the requirement for the overall thickness of a television is increasingly thin-walled. Side-in type is an important way of thin-walled, which needs to be applied to a light guide plate. After the light is transmitted into the light guide plate from the side of the light guide plate by a lamp bead, the point light source is converted into a surface light source, and the front surface of the light guide plate is provided with optical films, which have a light uniformity effect to improve the overall visual effect of the television. The back surface of the light guide plate is usually provided with a reflective sheet, which is used to reflect the light exposed on the bottom surface back into the light guide plate to improve the use efficiency of the light. TECHNICAL PROBLEM

[0004] However, due to the small OD (optical distance) value, the reflective sheet is usually attached to the light guide plate, and the friction between the reflective sheet and the light guide plate during transportation can cause the microstructure on the light guide plate to be damaged, which can cause adverse phenomena such as dark shadows, thereby affecting the overall visual effect of the television. TECHNICAL SOLUTION

[0005] Based on this, the present application provides a reflective sheet, a preparation method thereof, a backlight module and a display device.

[0006] In a first aspect, the present application provides a reflective sheet, comprising:

[0007] a reflective base layer;

[0008] a microstructure layer arranged on one side of the reflective base layer;

[0009] a flexible coating layer arranged on the side of the microstructure layer away from the reflective base layer.

[0010] In a second aspect, the present application provides a preparation method of a reflective sheet, comprising:

[0011] adopting a double-layer co-extrusion process to obtain a composite film layer, the composite film layer comprising a reflective base layer and a first film layer arranged in a stack;

[0012] The first film layer is embossed to form a first microstructure on the first film layer, and a microstructure layer is obtained;

[0013] The surface of the microstructure layer is coated with glue, and the glue is dried to form a flexible coating layer, and the reflective sheet is obtained.

[0014] In a third aspect, the embodiments of the present application provide a backlight module comprising the reflective sheet described above and / or the reflective sheet prepared by the method described above.

[0015] In a fourth aspect, the embodiments of the present application provide a display device comprising the backlight module described above. Advantages

[0016] The reflective sheet provided by the embodiments of the present application comprises a reflective base layer, a microstructure layer and a flexible coating layer which are sequentially stacked, wherein the microstructure layer can enhance the reflection of light, thereby improving the reflectivity of the reflective sheet, and the flexible coating layer is arranged on the surface of the microstructure layer and can protect the first microstructure in the microstructure layer. When the reflective sheet of the present application is applied to a backlight module, the flexible coating layer can also protect the optical component (such as a light guide plate) arranged above the reflective sheet, thereby avoiding the microstructure layer in the reflective sheet from causing abrasion or damage to the surface of the optical component, and thus the light output effect of the backlight module can be improved and the generation of dark shadows can be reduced, thereby the display effect of the display device using the backlight module can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG. 1 is a structural schematic diagram of the reflective sheet provided by the embodiments of the present application.

[0018] FIG. 2 is a three-dimensional structural schematic diagram of the microstructure layer provided by the embodiments of the present application.

[0019] FIG. 3 is a flowchart of the method for preparing the reflective sheet provided by the embodiments of the present application.

[0020] FIG. 4 is a structural schematic diagram of the composite film layer provided by the embodiments of the present application.

[0021] FIG. 5 is a schematic diagram after the first film layer is embossed provided by the embodiments of the present application.

[0022] FIG. 6 is a structural schematic diagram of the backlight module provided by the embodiments of the present application.

[0023] Element symbol explanation: 110-reflective sheet; 10-reflective base layer; 50-composite film layer; 51-first film layer; 20-microstructure layer; 21-first microstructure; 30-flexible coating layer; 100-backlight module; 120-light guide plate; 130-light source; 131-lamp bead; 132-circuit board; 125-second microstructure. Embodiments of the present application

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application.

[0025] Referring to FIG. 1, the reflective sheet 110 provided in the embodiments of the present application comprises a reflective base layer 10, a microstructure layer 20 and a flexible coating layer 30 which are sequentially stacked; wherein the microstructure layer 20 is arranged on one side of the reflective base layer 10, and the flexible coating layer 30 is arranged on the side of the microstructure layer 20 away from the reflective base layer 10.

[0026] The reflective sheet 110 provided in the embodiments of the present application comprises a reflective base layer 10, a microstructure layer 20 and a flexible coating layer 30 which are sequentially stacked, wherein the microstructure layer 20 can enhance the reflection of light, thereby improving the reflectivity of the reflective sheet 110, and the flexible coating layer 30 arranged on the surface of the microstructure layer 20 can protect the first microstructure 21 in the microstructure layer 20. When the reflective sheet 110 of the present application is applied to the backlight module 100, the flexible coating layer 30 can also protect the optical components (such as the light guide plate 120 or the diffusion plate) arranged above the reflective sheet 110, thereby avoiding the microstructure layer 20 in the reflective sheet 110 from causing abrasion or damage to the surface of the optical components, and further improving the light-out effect of the backlight module 100 and reducing the generation of dark shadows, so as to improve the display effect of the display device applying the backlight module 100.

[0027] Exemplarily, the material of the reflective base layer 10 comprises resin 40-70 parts, light-reflecting material 5-50 parts, compatibilizer 5-25 parts and antioxidant 0.05-1 part, in terms of weight parts.

[0028] Exemplarily, the part of resin in the reflective base layer 10 can be 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, etc., in terms of weight parts.

[0029] Exemplarily, the part of light-reflecting material in the reflective base layer 10 can be 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, etc., in terms of weight parts.

[0030] Exemplarily, the part of compatibilizer in the reflective base layer 10 can be 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, etc., in terms of weight parts.

[0031] Exemplarily, the proportion of the antioxidant in the reflective base layer 10 can be 0.05 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, etc. by weight.

[0032] It should be noted that the resin is the matrix of the reflective base layer 10, the light-reflecting material has a strong light-reflecting effect so as to enable the reflective base layer 10 to have a high light reflectivity, the compatilizer serves to improve the interfacial force between the resin and the light-reflecting material (usually inorganic particles), to improve the dispersity of the light-reflecting material in the resin matrix, the antioxidant serves to prevent the resin from being oxidized during processing and use, thereby preventing the performance of the resin from being degraded and prolonging the service life thereof.

[0033] Exemplarily, the thickness of the reflective base layer 10 is 30 μm-80 μm, for example, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, etc.

[0034] Exemplarily, the resin comprises at least one of polycarbonate (PC) and polycarbonate-polysiloxane block copolymer (Si-PC).

[0035] Exemplarily, the light-reflecting material comprises at least one of titanium white, aluminum oxide (Al2O3) and silicon dioxide (SiO2). It can be understood that the titanium white is titanium dioxide (TiO2).

[0036] Exemplarily, the average particle size of the light-reflecting material is 0.1 μm-0.5 μm, for example, 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, etc.

[0037] It should be noted that when the light-reflecting material comprises titanium white, the titanium white needs to be treated with siloxane so as to improve the dispersing effect of the titanium white in polycarbonate and reduce the degradation of polycarbonate. In some embodiments, the titanium white is selected from rutile titanium white 2233 with an average particle size of 0.2 μm-0.3 μm.

[0038] It can be understood that the polycarbonate-polysiloxane block copolymer is prepared by adding a polydimethylsiloxane (PDMS) block into a polycarbonate (PC) molecular chain in a copolymerization form. Since the polycarbonate-polysiloxane block copolymer (Si-PC) contains a siloxane bond, the siloxane bond has strong polarity, thereby enabling the polycarbonate-polysiloxane block copolymer to have strong compatibility with the light-reflecting material (titanium white, aluminum oxide, silicon dioxide, etc.), so as to improve the stability of the material of the reflective base layer 10, to reduce the processing difficulty, and to prolong the service life of the reflective base layer 10.

[0039] Exemplarily, the compatibilizer includes at least one of an acrylate ionomer, a polyethylene wax, and dipentaerythritol stearate.

[0040] Exemplarily, the antioxidant includes at least one of a hindered antioxidant and a phosphite antioxidant.

[0041] Exemplarily, the hindered antioxidant includes at least one of a hindered phenolic antioxidant and a hindered amine antioxidant.

[0042] In some embodiments, the antioxidant can include at least one of antioxidant 1010 (a hindered phenolic antioxidant) and antioxidant 168 (a phosphite antioxidant).

[0043] Exemplarily, the microstructure layer 20 includes a plurality of first microstructures 21 arranged in an array, the first microstructures 21 are in the shape of a truncated pyramid, the height of the first microstructures 21 is 15 μm-40 μm, for example, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, etc.

[0044] It should be noted that, since the surface of the microstructure layer 20 has a plurality of protrusions (i.e., the first microstructures 21), the light irradiated to the surface of the microstructure layer 20 is subjected to a large amount of diffuse reflection, greatly reducing the amount of light incident and increasing the amount of reflection, thereby improving the reflectivity of the microstructure layer 20.

[0045] Referring to FIG. 2, when the first microstructures 21 are in the shape of a truncated pyramid, the cross section of the first microstructures 21 can be a trapezoid, the upper base of the trapezoid is the side close to the flexible cladding layer 30, and the lower base of the trapezoid is the side close to the reflective base layer 10.

[0046] Exemplarily, the shape of the first microstructures 21 can also be a pyramid, a cone, or other shapes.

[0047] Exemplarily, the microstructure layer 20 contains a plurality of bubbles inside.

[0048] It should be noted that, by setting the microstructure layer 20 to contain a plurality of bubbles inside (i.e., setting the microstructure layer 20 to be a foamed structure), the reflectivity of the microstructure layer 20 can be further improved, and thus the reflectivity of the reflective sheet 110 can be further improved.

[0049] It can be understood that, when the microstructure layer 20 is not foamed, the microstructure layer 20 is a transparent film layer, at this time, light is more likely to pass through the microstructure layer 20 without reflection, after the microstructure layer 20 is foamed, the transparency of the microstructure layer 20 is reduced, at this time, part of the light is reflected on the surface of the microstructure layer 20, and part of the light is reflected on the surface of the bubbles in the microstructure layer 20, thereby reducing the loss of light when passing through the microstructure layer 20 and improving the reflectivity of the light.

[0050] It should be noted that the smaller the volume of the bubbles in the microstructure layer 20, the greater the density, and the better the reflection effect.

[0051] Exemplarily, the material of the microstructure layer 20 comprises a resin material (e.g., polycarbonate).

[0052] Exemplarily, the microstructure layer 20 forms the bubbles inside by a foaming method, at this time, the material of the microstructure layer 20 further comprises a foaming agent.

[0053] Exemplarily, the bubbles in the microstructure layer 20 can be formed by physical foaming and / or chemical foaming.

[0054] Exemplarily, physical foaming mainly utilizes physical principles for foaming, such as by dissolving a gas or a liquid into plastic, and then expanding or vaporizing it. Commonly used physical foaming agents include fluorochlorohydrocarbon (such as freon), low alkane (such as pentane), carbon dioxide, nitrogen, oxygen, etc. These foaming agents become supercritical fluid after high-temperature and high-pressure treatment, and become gas when the conditions change to normal temperature and pressure, thus realizing physical change and foaming.

[0055] Exemplarily, chemical foaming is by adding specific chemical foaming agents, which produce nitrogen, carbon monoxide, carbon dioxide and ammonia gas when decomposed by heat, so that the plastic melt is full of bubbles. Chemical foaming agents are divided into inorganic chemical foaming agents and organic chemical foaming agents. Inorganic foaming agents include heat-sensitive carbonates (such as sodium carbonate, ammonium bicarbonate, etc.), nitrite salts, borohydride compounds, etc., which are characterized by heat absorption during foaming, also known as heat-absorbing foaming agents; organic foaming agents include azo compounds, N-nitroso compounds, sulfonamidazole compounds, etc.

[0056] Exemplarily, the diameter of the bubbles is 1 μm-15 μm, such as 1 μm, 3 μm, 5 μm, 7 μm, 10 μm, 12 μm, 15 μm, etc.

[0057] Exemplarily, the ratio of the sum of the volumes of the plurality of bubbles in the microstructure layer 20 to the total volume of the microstructure layer 20 is 5%-50%, such as 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc. It can be understood that the total volume of the microstructure layer refers to the volume of the resin matrix of the microstructure layer and the sum of the volumes of all bubbles.

[0058] Exemplarily, the outer surface of the first microstructure 21 can be a rough uneven surface, because in the process of embossing, the breaking of part of the bubbles in the first microstructure 21 causes the formation of pits on the surface of the first microstructure 21, and in turn causes the outer surface of the microstructure layer 20 to form a rough uneven surface. It can be understood that when the outer surface of the first microstructure 21 is uneven, the light diffusing effect on the surface of the first microstructure 21 can be further improved, and in turn the reflectivity of the microstructure layer 20 can be improved, so that the reflectivity of the reflective sheet 110 can be improved.

[0059] Referring to FIG. 1, the side surface of the flexible coating layer 30 away from the microstructure layer 20 can be a plane, that is, the flexible coating layer 30 can completely fill the gaps between the first microstructures 21 in the microstructure layer 20. At this time, the upper surface of the reflective sheet 110 also presents a smooth surface, so that when the reflective sheet 110 is in contact with the light guide plate, the abrasion of the light guide plate caused by the friction between the reflective sheet 110 and the light guide plate can be avoided.

[0060] Exemplarily, the flexible coating layer 30 includes 90-97.5 parts of acrylic resin, 2-7 parts of light stabilizer, and 0.5-3 parts of antistatic agent by weight.

[0061] It should be noted that by adding a light stabilizer to the flexible coating layer 30, the light stabilizer can inhibit or weaken the degradation of the acrylic resin by absorbing ultraviolet light, hindering the generation of free radicals, and the like, effectively prolonging the light aging life of the acrylic resin and improving its performance and service life.

[0062] It should be noted that by adding an antistatic agent to the flexible coating layer 30, the generation of static electricity can be prevented or dissipated, and the adsorption and accumulation of dust and debris on the surface of the flexible coating layer 30 caused by static electricity can be avoided, thereby affecting the reflection effect of the reflective sheet 110. In addition, because the surface of the flexible coating layer 30 is not easy to generate static electricity, when the light guide plate is arranged above the reflective sheet 110, the light guide plate and the reflective sheet 110 can also be prevented from being adsorbed together due to static electricity, thereby reducing the generation of dark shadows.

[0063] Exemplarily, the flexible coating layer 30 includes 90-97.5 parts of acrylic resin, 2-7 parts of light stabilizer, and 0.5-3 parts of antistatic agent by weight.

[0064] Exemplarily, the flexible coating layer 30 includes 90-97.5 parts of acrylic resin, 2-7 parts of light stabilizer, and 0.5-3 parts of antistatic agent by weight.

[0065] Exemplarily, the proportion of the antistatic agent in the flexible cladding layer 30 can be 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, etc. by weight.

[0066] Exemplarily, the thickness of the flexible cladding layer 30 is 20-50 μm, for example, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc.

[0067] Exemplarily, the light stabilizer comprises at least one of benzotriazole ultraviolet light absorbers and basic hindered amine light stabilizers.

[0068] Exemplarily, the antistatic agent comprises at least one of lithium salt antistatic agents (AS-1 type antistatic agent), ionic liquid type antistatic agents (AS-2 type antistatic agent), and non-ionic antistatic agents (AS-3 type antistatic agent).

[0069] Exemplarily, the flexible group contained in the acrylic resin comprises at least one of hydroxyl, carboxyl, amino, and epoxy groups.

[0070] It should be noted that by adding flexible groups such as hydroxyl, carboxyl, amino, and epoxy groups in the acrylic resin, the polarity, solubility, mechanical properties, etc. of the acrylic resin can be effectively adjusted, and the flexibility of the acrylic resin is improved.

[0071] Referring to FIG. 3, the application provides a preparation method of the reflective sheet, comprising:

[0072] S100, referring to FIG. 4, the composite film layer 50 is prepared by using a double-layer co-extrusion process, and the composite film layer 50 comprises the reflective base layer 10 and the first film layer 51 which are stacked.

[0073] Exemplarily, the preparation of the composite film layer 50 by using the double-layer co-extrusion process can comprise:

[0074] After the raw materials of the reflective base layer 10 are mixed according to the proportion and uniformly, they are dried at 80-100 °C; after the raw materials of the first film layer 51 are mixed according to the proportion and uniformly, they are dried at 80-100 °C;

[0075] The raw materials of the reflective base layer 10 are placed in the first extruder, and the raw materials of the first film layer 51 are placed in the second extruder, and the composite film layer 50 is extruded through the common die in sequence.

[0076] Exemplarily, the first extruder and the second extruder can both be double-screw extruders, and the temperature of the double-screw extruder is 250-290 °C, and the rotating speed is 15-100 r / min.

[0077] It can be understood that the first film layer 51 is a preliminary film layer for preparing the microstructure layer 20.

[0078] In some embodiments, when a large number of bubbles need to be contained in the microstructure layer 20, a foaming agent can be added to the raw material of the first film layer 51. Since the foaming agent can undergo physical and / or chemical changes in a heated state during the extrusion process, a large number of bubbles can be generated in the first film layer 51.

[0079] S200, referring to FIG. 5, the first film layer 51 is embossed to form the first microstructure 21 on the first film layer 51, and the microstructure layer 20 is obtained.

[0080] For example, the first film layer 51 can be embossed by a calender. It can be understood that the composite film layer 50 prepared by the extrusion process has a high temperature and a large plasticity when it is just prepared. Therefore, the composite film layer 50 is passed through the calender with the first microstructure 21 while it is hot, so that the first microstructure 21 is formed on the first film layer 51, and the microstructure layer 20 is obtained.

[0081] S300, referring to FIG. 1, the glue is coated on the surface of the microstructure layer 20, and the glue is dried to form the flexible coating layer 30, and the reflective sheet 110 is obtained.

[0082] It can be understood that the material of the glue includes the material of the flexible coating layer 30 and a solvent as described above. The amount of the solvent is adjusted based on the viscosity of the glue. The solvent volatilizes after the glue is dried, and the flexible coating layer 30 is obtained.

[0083] Referring to FIG. 6, the present application provides a backlight module 100, which includes the reflective sheet 110 as described above and / or the reflective sheet 110 prepared by the method as described above.

[0084] Referring to FIG. 6, the backlight module 100 can be a side-in backlight module. In this case, the backlight module 100 further includes a light guide plate 120 and a light source 130. The light guide plate 120 is arranged above the reflective sheet 110, and the light source 130 is arranged at the side of the light guide plate 120. The light source 130 can include a lamp bead 131 and a circuit board 132 connected to the lamp bead 131. The circuit board 132 is arranged on the side of the lamp bead 131 away from the light guide plate 120.

[0085] Referring to FIG. 6, the side surface of the light guide plate 120 facing the reflective sheet 110 can be provided with a second microstructure 125. It can be understood that, since the surface of the reflective sheet 110 is provided with the flexible coating layer 30, even if the reflective sheet 110 and the light guide plate 120 are in direct contact, the microstructure layer 20 in the reflective sheet 110 will not cause damage to the second microstructure 125 at the bottom of the light guide plate 120, thereby prolonging the service life of the light guide plate 120 and improving the light-out effect of the backlight module 100 and reducing the generation of dark shadows.

[0086] Exemplarily, the second microstructure 125 can be a convex structure, and the outer surface of the second microstructure 125 can be an arc surface.

[0087] It can be understood that, in some other embodiments, the backlight module 100 can also be a direct-lit backlight module, and the backlight module 100 further includes a diffusion plate and a light source, wherein the diffusion plate is arranged above the reflective sheet 110, and the light source is arranged between the diffusion plate and the reflective sheet 110.

[0088] The embodiment of the present application provides a display device including the backlight module 100 as described above.

[0089] Exemplarily, the display device can further include a display panel, and the backlight module 100 is arranged at the light-in side of the display panel to provide a surface light source for the display panel. Exemplarily, the display panel can be a liquid crystal display panel.

[0090] Exemplarily, the display device can be a television, a computer display, a mobile phone, a tablet computer, an advertising display screen, and the like terminal, and can also be a game device, an augmented reality (AR) device, a virtual reality (VR) device, a data storage device, an audio playing device, a video playing device, a wearable device, and the like device with a display screen, wherein the wearable device can be a smart bracelet, smart glasses, a smart watch, smart decoration, and the like.

[0091] The reflective sheet, the preparation method thereof, the backlight module and the display device provided by the embodiment of the present application are described in detail above. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the present application. Meanwhile, according to the principles of the present application, the specific implementation manners and application ranges will be changed by those skilled in the art, and the above description of the present application should not be understood as a limitation.

Claims

1. A reflective sheet, comprising: a reflective base layer; a microstructure layer disposed on one side of the reflective base layer; a flexible coating layer disposed on the other side of the microstructure layer.

2. The reflector sheet according to claim 1, wherein The material of the reflective base layer comprises resin 40-70 parts by weight, reflective material 5-50 parts by weight, compatibilizer 5-25 parts by weight, and antioxidant 0.05-1 part by weight.

3. The reflector sheet according to claim 2, wherein The resin comprises at least one of polycarbonate and polycarbonate-polysiloxane block copolymer.

4. The reflector sheet according to claim 2, wherein The reflective material comprises at least one of titanium dioxide, aluminum oxide, and silicon dioxide.

5. The reflector sheet according to claim 2, wherein The average particle size of the reflective material is 0.1-0.5 μm.

6. The reflector sheet according to claim 2, wherein The compatibilizer comprises at least one of acrylate ionomer, polyethylene wax, and dipentaerythritol stearate.

7. The reflector sheet according to claim 2, wherein The antioxidant comprises at least one of hindered antioxidant and phosphite antioxidant.

8. The reflector sheet according to claim 1, wherein The thickness of the reflective base layer is 30-80 μm.

9. The reflector sheet according to claim 1, wherein The microstructure layer comprises a plurality of first microstructures arranged in an array, the first microstructures being in the shape of a prism, and the height of the first microstructures being 15-40 μm.

10. The reflector sheet according to claim 1, wherein The microstructure layer contains a plurality of bubbles inside.

11. The reflector sheet according to claim 10, wherein The diameter of the bubbles is 1-15 μm.

12. The reflector sheet according to claim 10, wherein The ratio of the total volume of the plurality of bubbles in the microstructure layer to the total volume of the microstructure layer is 5-50%.

13. The reflector sheet according to claim 1, wherein The material of the microstructure layer comprises resin material.

14. The reflector sheet according to claim 1, wherein The flexible coating layer comprises acrylic resin 90-97.5 parts by weight, light stabilizer 2-7 parts by weight, and antistatic agent 0.5-3 parts by weight; and / or The thickness of the flexible coating layer is 20-50 μm.

15. The reflector sheet according to claim 14, wherein The light stabilizer comprises at least one of benzotriazole ultraviolet light absorber and basic hindered amine light stabilizer.

16. The reflector sheet according to claim 14, wherein The antistatic agent comprises at least one of lithium salt antistatic agent, ionic liquid antistatic agent, and non-ionic antistatic agent.

17. The reflector sheet according to claim 14, wherein The acrylic resin comprises a flexible group, the flexible group comprising at least one of hydroxyl, carboxyl, amino, and epoxy. 18.A method for preparing a reflective sheet, comprising: obtaining a composite film layer by using a double-layer co-extrusion process, the composite film layer comprising a reflective base layer and a first film layer stacked together; performing embossing on the first film layer to form first microstructures on the first film layer, thereby obtaining a microstructure layer; applying glue on the surface of the microstructure layer and drying the glue to form a flexible coating layer, thereby obtaining the reflective sheet. 19.A backlight module, comprising the reflective sheet of any one of claims 1-17 and / or the reflective sheet prepared by the method of claim 18. 20.A display device, comprising the backlight module of claim 19.

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